Leuze electronic
MSI 420.TMC-03
9
Phase 7 - End of muting
The muting process is only ended and the protective sensor only resumes normal operation again after
the second muting sensor (Start 2) is no longer occupied by the pallet.
The muting process is generally ended as soon as one of the following signal changes occurs:
Control signals switched off
• Deactivation of Control 1 (signal change from HIGH to LOW)
• Deactivation of Control 2 (signal change from HIGH to LOW)
Start 2 switched on
• Activation of Start 2 (signal change from LOW to HIGH)
As soon as the MSI 400 detects one of the listed signal changes, bridging of the protective sensor is
canceled immediately.
3.4
Override - Starting system with occupied protective sensor
The Override function allows transported objects to be removed if they have come to a standstill in the
protective field of the protective device (e.g. photoelectric sensor) due to power failures, the triggering of
an emergency stop, muting errors or other similar circumstances.
If a valid override sequence with a LOW-HIGH-LOW transition (min. 350 ms and max. 3 s; longer or
shorter pulses are ignored) occurs at input I2, the release output becomes HIGH as if the muting conditions
were fulfilled.
3.5
Reactivation of muting
Reactivation of the bridging function is only possible after the system has been reset to the base state.
To do this, the following conditions must be satisfied:
• Control 1 signal set to LOW potential
• Control 2 signal set to LOW potential
• Start 1 IN signal set to HIGH potential
• Start 2 IN signal set to HIGH potential
Muting can then be restarted by activating the two control signals.
Figure 3.7: Phase 7 - End of muting
Danger zone
Protective sensor
Start 1
Start 2
WARNING
Unmonitored overrides may result in serious injury!
A person with the necessary competence must observe the procedure exactly.
Make certain that the danger zone can be viewed from the start button and that the entire process can
be observed by a responsible person.
Before and during the override, ensure that there are no people in the danger zone.
